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B. H. KETGHUM. SAW SETTING DEVIUE.

No. 287.835. Patented Nov. 6, 1-883.

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SAW SETTING'DEVIGE.

Patented Nov. 6, 1883.

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Y 1 UNITED STATES.

PATENT OFFICE.

EVERETT H. KETGHUM, OF RIOEVILLE, PENNSYLVANIA.

sAw-sE Tme DEVICE.

SPECIFICATION forming part of Letters Patent No. 287,835, dated November 6,1883.

' Application filed March 7, 1883. (No model.)

J To all whom it may concern.-

' Be it known that I, EVERETT H. KETonUM,

of Riceville, in the county of Crawford and- State of Pennsylvania, have invented a certain 5 new and Improved Saw-Setting Device; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, andto IO the figures and letters of reference marked taken on the linear w of Fig. 1; Fig. 4, ahorizontal section taken on the line 3 yof Fig. 1.- Figs. 5, 6, and 7 are respectively top plan, front, and side views of the bed-piece or anvil; and Fig. 8 is a view of a modified form of gage. Similar letters of reference in the several figures denote the same parts. j

c A represents the table on which the blade of the saw to be set rests; B, a vertically-moving punch mounted in suitable guides or crossheads, 0, secured to an upright standard, D; E, a bed-piece or anvilmounted in the standard, and with which thepunchB co-operates to set the teeth; and F a gage'for regulating the length of the set from the point of the tooth. The bed-piece or anvilE is of steel, and has, preferably, four straight sides, forming a rectangle, a flat lower end, and an upper end or operating-surface outwardly curved or rounded from its side edge, a, to its opposite side edge, b, and also outwardly curved or rounded from its front edge, a, back down'to-its opposite rear edge, (1, slightly crowning at the point e, as shown clearly in Figs. 5 and 7. A mark is by preference made at the front, at f, to indicate the middle of the bed-piece, and to serve as a guide in adjustingasaw-tooth in position. The lower end or operating-face of the movable punch B is inclined downwardly and backwardly from front to rear, and when brought down strikes the transverse middle of the bed- The upper end of the punch is provided with a head, e, adapted to receive the blows of a hammer or mallet employed to strike the punch downward toward the bed-piece or anvil, and between the head G and the uppermost guide or cross-head, O, and surrounding the punch, is a spiral spring, H, whose function is, among others, to retract the punch away from the bed-piece after it is struck.

The gage F consists of a small metal plate shaped to substantially conform to the trans verse contour of the bed-piece or anvil, and

horizontal arm, 0, that encircles the punch I between its head G and the spiral spring H.

Normally the front edge of the gage projects forward upon the bed-piece or anvil more or less, and serves as a stop to the point of the tooth to be operatedupon, and gages or regulates the extent of the set. punch is struck and forced down, slide-bar N and connecting-rod M are also forced down, and the pivoted plate K is tilted backward, as indicated bythe arrow,thus,throughtheinstrumentality of the horizontal short shaft J, withdrawing the gage from off the bed-piece and out of the path of the descending punch. As the punch again rises under the elastic force of the spring a reverse motion of the parts takes place,

and the gage is again projected over the bedpiece into position to properly arrest and gage the next tooth to be operated upon. The disand is supported at its outer edge upon theend of an adj usting-screw, Q, working through a screw-threaded arm, R. Byvarying the position of the table by means of the screw Q, the extent of the set+that is to say, the amount of divergence of the teeth out of linecan be very accurately regulated. The function of Each time the the adjustable table must not be confounded with that of the gage F, for while the latter regulates and determines the length of the set, or, in other words, the length of the part of the tooth set out or diverged,the former (the table) regulates the extent of the divergence.

Where small sawsi. e., saws whose teeth are quite close togetherare to be set, a gage anvil upside down, so as to expose its fiat end, 7

and to substitute a flat square-ended punch for the one shown.

In order to more easily remove the bedpiece or anvil, the mortise in the standard D may be made deeper at the lower end or bottom, and made to extend upwardly on a true line nearly to the top at the back, andto bring the bed-piece or anvil into an upright position an ad justable set-screw may be introduced through the back side of the upright standard and made to press and hold the bed-piece or anvil in position.

Having thus described my invention, I claim as new 1. The combination, with the bed-piece or anvil, of the vertically-moving pnnch,the gage,

and connections, substantially as described, between the gage and the punch, whereby the gage is withdrawn as the punch descends, and projected again as the punch ascends, substantially as described.

2. The combination, with the bed-piece or anvil, of the vertically-movin g punch, the gage, connections, substantially as described, between the gage and punch, and the stop for regulating the extent of the projection of the gage over the bed-piece, substantially-as described.

3. The combination, with the punch and bed-piece or anvil, of the hinged gage, the vibratingplate carrying the shortshaft to which the gage is hinged, the connections between the vibrating plate and the punch, and the spring, substantially as described.

4. The combination, with the vibrating plate and the gage, of the connections between said plate and the punch, the spring, and the adjustable screw forming the back-stop of the plate, substantially as described.

5. The combination of the bed-plate, the punch, the gage, the connections by which the gage is operated from the punch, and the hinged adjustable table, the whole arranged and combined substantially as described.

EVERETT H. KETCHUM.

Witnesses:

E. M. R-IoE, CHAS. E. MARTIN, JOHN W. RHODES. 

